public class Example4_10 {
    public static void main (String args[]) {
        Lader.下底= 100;
        Lader laderOne =new Lader();
        Lader laderTwo=new Lader();
        laderOne.设置上底(28);
        laderTwo.设置上底(66);
        System.out.println("laderOne的上底"+laderOne.获取上底());
        System.out.println("laderOne的下底"+laderOne.获取下底());
        System.out.println("laderTwo的上底"+laderTwo.获取上底());
        System.out.println("laderTwo的下底"+laderTwo.获取下底());
    }
}

